Boring-bar



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LUTHER R. FAUGHT, OF PHILADELPHIA, PENNSYLVANIA.

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SPECIFICATION-forming part of Letters Patent No. 311,652, dated February 3, 1885.

Application filed June 4, 1884 To @ZZ whom, z' may concern:

Be it known that l, LUTHER R. FAUGHT, vof the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Boring-Bars, ot' which improvements the following is a specitieation.

The object of my invention, which relates to boring-bars having two transverse slots at right angles. one to the other, each adapted to receive a tool or cutter, as in my Letters Patent Nos. 241,481, 253,523, and 289,522, dated May 17, 1881, February 14, 1882, and December 4, 1883, respectively, is to provide improved means for securing one or a pair of critters in position in the bar in such manner as to be iirmly held therein and readily removed and replaced, as required.

To this end my improvements consist in a clamping-k ey having a ilattened face upon its inclined side and a curved or segmental face upon its straight side, and in the combination of a clamping-key, as set forth, a tool or cutter, and a transversely-slotted boring-bar, all as hereinafter more fully set forth.

In au application for Letters Patent filed by me December 29, 1883, Serial No. 115,960, I have illustrated my improved clamping-key employed as the mechanical equivalent of a clamping-screw `for securing a pair of cutters of special construction, and having disclaimed saidl key per se as ofthe invention claimed in said application, it will, in accordance with the reservation therein made to such effect, be herein described and claimed.

ln the accompanying drawings, Figures 1 and` 2 are longitudinal central sections at right angles one with the other, respectively, through a portion of a boring-bar embodying my invention; Fig. 3, a. transverse section through the same at the line x x of Fig. 2, and Fig. 4 a longitudinal central. section showing cutters of different form secured in a similar manner to those of Figs. 1 and 2.

The boring-bar A is of similar construction to that shown in my Letters Patent No. 253,523 aforesaid, having a series of transverse or diametric slots, a a', arranged in pairs and at right angles one to the other at desired intervals in the length of the bar. @ne of the slots of each pair is in line with and communicates with two of a series of four longitudinal grooves (No model.)

or recesses, ai, formed in the bar A, and the other slot ot' each pair is similarly located relatively to the other two grooves. The slots a a serve for the reception, at any desired point, ofthe two boring tools or cutters, E F, which present four cutting edges spaced equally about the aXis of the boring-bar.

The cutters E and F, which are fully set forth in my application, Serial No. 115,960, before referred to, are not herein claimed. The cutter E is provided with shoulders or bearing-projections e2 on its top, which tit against bearings in a transverse slot or opening, g3, formed in the bar A, said opening being, by preference, of segmental transverse section, correspondi ng with the curvature ofthe clamping-key G, to be presently described, in order to admit of the reversal of the cutters and the insertion of the key Gin said slot, it' desired. rEhe cutter F passes freely through a trans verse opening or passage, c, in the cutter E, and has central shoulders or bearing-projections, j', formed on its top, which iit against similar bearings on one side ofthe slot a. The cutters are secured in position by atransverse clamping key or wedge, G, passing through a key-slot, g, in the bar A, and having a tlattened face, g', on its inclined side, which bears against the face of the cutter E opposite that on which the shoulders c2 are formed. rlhe opposite or straight side ot' the key G has a semicircular or otherwise segmental face, g2, which bears against a recess of corresponding segmental form on the side of the key-slot 1] farthest from the cutter E. The segmental bearing of the key on its seat in the bar enables it to swivel thereon as may be required, to insure a flat thrust on the cutters and on the bar, so that the strain shall be exerted, as nearly as practicable, equally on each side ot' the axis of rotation. rllhe key or wedge G may be made of greater depth, if desirable, as shown in dotted lines in Fig. 2, and in full lines in Fig. 4, and in the latter figure the key is shown as employed to secure a pair of recessed cutters similar to those shown in Patent No. 253,523, and in substitution ofthe key l) and gib C of said patent.

My improvements are applicable in connection with one or a pair of cutters, andare independent of the specitic form of cutter or cutters employed, the latter in and of them'- selves not forming part of my present invention.

I claim as my invention and desire to secure by Letters Patent- 5 1. A olamping-key-for boring-cutters havtool or cutter litting in a slot in said bar, and a clamping key or wed ge iitting in a transverse slot in said bar at right angles to the cutterslot, said key bearing by a flattened face 15 against the cutter, and by a curved or seging a ilattened face upon its inclined or bevy mental face against the boring-bar. eled side and a curved or segmental face upon its straight side, substantially as and for the l LUTHER R' FAUGHT' purpose set forth. Witnesses: 1o 2. The combination, substantially as set GHAs. E. PANooAsT,

forth, of a transversely-slotted boring-bar, a v GEORGE ROBINSON. 

